Editing Iterator pattern (section)

=== UML class and sequence diagram ===
[[File:w3sDesign Iterator Design Pattern UML.jpg|frame|none|A sample UML class and sequence diagram for the Iterator design pattern.<ref>{{cite web|title=The Iterator design pattern - Structure and Collaboration|url=http://w3sdesign.com/?gr=b04&ugr=struct|website=w3sDesign.com|access-date=2017-08-12}}</ref>]]
In the above [[UML]] [[class diagram]], the <code>Client</code> class refers (1) to the <code>Aggregate</code> interface for creating an <code>Iterator</code> object (<code>createIterator()</code>) and (2) to the <code>Iterator</code> interface for traversing an <code>Aggregate</code> object (<code>next(),hasNext()</code>).
The <code>Iterator1</code> class implements the <code>Iterator</code> interface by accessing the <code>Aggregate1</code> class.

The [[UML]] [[sequence diagram]]
shows the run-time interactions: The <code>Client</code> object calls <code>createIterator()</code> on an <code>Aggregate1</code> object, which creates an <code>Iterator1</code> object and returns it
to the <code>Client</code>.
The <code>Client</code> uses then <code>Iterator1</code> to traverse the elements of the <code>Aggregate1</code> object.